Machine fob cutting wood-screws



EVER. Horamrloempn N,PETER 5, PHOTOALHHOGRAPHER. WASHINGTON. u C.

- UNITED STATES Q PATENT oEEioE;

`JAMES KEANE AND THOMAS KEANE, 0E 'iiAvERsTRAw NEW YORK.

i MACHINE FOR CUTTING-*WOOD-SCREWS.

j Specification of Letters Patent N o. 830, dated July 9, 1,888.

To aZZ whom t may concern Be it known that we, JAMES KEANE and THOMAS KEANE, of H'averstraw, in the county of Rockland and State of New York, have invented a .new` and usefulV improvement in the mechanical means of cutting the thread or worm on screws used by carpen` ters and others, commonly called woodscrews or` screw-nails, which -improved means are equally applicable to cut the thread on screw-bolts of all sizes, for which we seek Letters Fatent of the United States, and that the mode of constructing and using the lsaid improvements are fully set forth and shown in the following description and in the drawings annexed to and making a Ypart of this specification, wherein- Figure l, is a general sectional elevation,`

Fig. 2, is a horizontal .plan and Fig. .3 is a lvertical cross section representing the mechanism of these improvements` as fitted `:tor use and work by us. The other figures in the drawing are consecutively referred to herein for clear explanation, and the same letters or marks of reference apply to the ,saine parts in'all the several Vgures. j

A, A, is a pair of bed sheers shownas of wood, but may be made of iron. On these are mounted andiXed at one end the mandrel head B B, and at the other `end the puppet head C, C. In .the mandrel head is the .hollow mandrel af, and on it the` fast` pulley ZJ, and loose pulley e the mandrel being kept up to the collar by the back spring Z and screw e. On the nose ofthe mandrel is the face chuck f, fitted with slots and' screws by which to adjust and fasten .four carriage plates, g, g, g, .g, shown direct in Fig.- `18 and sectionally in Figsll) and 20.',

On each of these carriage plates is a back lug, h, h, i, h, and a face lug i, z', ,11, 5, from the outside of the back lugs the back center screws lc, 7d 7c` la are tapped in and opposite to these are the forecente'r scews Z, IZ, Z, Z, tapped through the face lugs and between their points `are the small steel shafts or arbors m, m, m, m, `each standing successivelyat right angles to each other and carrying each a circular steel `chaser wheel n, n,

n, n, whoseedges are parallel tothe centerl andare c utto thefspace and rake Vof. any required screw thread in parallel lines across the .edges in Van engine lathe in exactly the same way as'the teeth of a Vworm wheel ,are usually cut except'that the edges are allfleft as sharp as the metal will work, and the face of the wheel is dished in to give arr acute angle to the cutting edge of each tooth when in use as hereafter described and withinthe first dishing the wheel is again dished more ground by being' presented to any fitgrinding substance. of these wheels is shown in large scale inthe detached Figs. l() and 11. When the edge nl is dull` grinding that part` of the wheel will renew the edge, as long as the substance toward the edge 'n2 will stand, and the n3 being thrown inward allows the` edge nl to come up and be adjusted by thecenter ness of the boss being protruded toward n* i in the opposite. direction sustainssgthe wheel steadily on the arbor m. On comparing these chaser Wheels` with the die wheel cuts by a lightly acute anglededge with a succession of teeth which ,clearthemselves of the chips without risk ofinjury to the...`

teeth' or the wheel or the`screw,while the die wheel is liable to .choke in the groove n and split the wheel, or break thescrew shaft which is being cut. j j

In the puppet heads c shown in section` in Fig. 4c is fixed the puppet bar o whose end within` the machine` terminates `in a Y screw driver point p. The extent otmotioii f while the slot w, inthe lever allows the need-I ful lateral-motion to slide the bar o.

j In the hollow tube formed Vwithin the mandrel a is the shaft y, shown `detached in Fig 21, ,whose-inner end is Ia leadingscrew accurately fttedrtowork with the teeth of m5 thechaser wheels n, n, n, v1).` The back end of this screw shaft is a square which enters a corresponding slotted mortise in the spring` a, and a small collar el, keepsv the shaft from entering too `far into the mandrel tube and ljlo abruptly by which the face'nl, can be readily The direct and sectionalform Y screws 7c and Z, asrequired, while the thickshown direct in Fig. l2'and in sectionin` Fig. 13, it will be seen that the chaserwheel Y and the screw shaft from heating.

a collar and pair of small rollers z2 keep the spring out near the end of the shaft y. In this position the screw end of the shaft y will be in gear with the teeth of the wheels n, n, n, n, and if motion be given to the mandrel a; the shaft y will remain stationary and the wheels n, n, n, a, will revolve on their arbors. Y

If the workman takes a screw shaft which is only headed and notched and holding it by small pliers on the point of the screw driver p, in thenotch of the screw head Yforces it by the lever s in the direction of clean thread upon the blank screw shaft4 while they revolve as 'if running oif the shaft itself, and on the workman returning the lever in the direction of the arrow No. 2, Fig'. 1, the leading screw shaft y will re- Y turn by the power of the spring e and push out the newly cut screw then coming into gear Vwith the chaser teeth. The shaft y will keep them ready to receive another screw shaft and cut it in the same manner. A small stream of watertor lubricatory mat-- ter is to be kept constantly running on they chaser wheels when in use to prevent them It has been noticed that the chuck is to be driven around in the opposite direction tol `that usually practised; but if the lugs 7L and 'i are placed counterhanded in the carriages g, g, g., g, or turned exactly opposite, the

wheels n, n, n, will then stand end for end v`of the position represented, and the chuck may bedriven in the usual direction. In

` 1 any case the edges of the'chaser wheels n',

11,1, minust be accuratelyY set or adjusted Vby the screws and slots inthe chuck f and by their own center screws .Zt and Z to work lat the proper distance from the center of i .the screw shaft, which will be finished with wheels which will then produce exactly the 1 same effect, as if the a thread whose depth will diminish when coming near the upper end and thus leave Vthe substance of the shaft full where the Vmost strength is wanted. Y f

Y VThemachine is shown as mounted hori:

sso

capable of leadingit into any wood of modcrate hardness. Y

When it is'wishedv to cut a screw somewhat largerl than usual it may be done as shown in Figs. 5 and 6. The screw al, being held Vin any convenient mechanical manner tward the head" and made to revolve on the puppet centre b1. The vchaser wheel' c1 and carriage Z1 are made to travel inthe Vslot el,

in the movable slide f1, by a slotted lever g1, in the direction of the arrow h1, and the position of the slide f1, may be so adjusted that the teeth ofthe chaser wheelcl, shall begin to act at a. small depth near thehead and finish to a sha-rp point.

Where it is desired toy cut a large screw or bolt, the mode shown in Figs. 7 8 and 9 may be adopted. The boltrz'1 is mounted ina hand or'power lathe, the puppet' center slide fof whichrinust be made ofan unequal shape so as to throw the strength behind the center of the slide,'and allow the motion of the chaser Vwheel p1. The chuck 101 has a toothed edge, and gears into an .intermediates wheel Z1 on a carriageV mounted onrthe mandrel head; this again 4 gears into the tooth wheel m1 VonV the leading screw,'n '0,- of the same-thread as the vchaser wheel, which leading screw works in theY nutV onY the Afront edge ofV the parallel 'slide rest g1,vcarrying the chaser wheel p1.

If Va slow motion be given to the chuck 701 the leading screw 'n50 will b-ring the Yslide rest g1 by a progressive motion toward the mandrel and the chaser teeth coming in contact Vwith 'the screw bolt will eachsuccessively cut a portion vof athread wheel rolls on its own vertical center, and

Ythe bolt goes around with the chuck. The

chuck may be made as shown in theY detachedFigs. 14, 15 and 16, to. allo-wof an intermediate small wheel s1 being Vmounted to gear from the chuck'wheel .t1 :into the leading screw wheel "v1 and thev leading screw u1 itself gear into the, outer edge 0f the chaser wheel w1 and the parts may Yall be mounted on bracket bearings with only a slide :r1 to guide the chaser wheel up f v 12o as it cuts, or the inotion maybe arranged to carry onward the screw shaft that is to be cut. A screwdriver nose in the chuck Ymay be used to enter the notch in the head of their own rake on the bolt as the chaser A angle may be varied to give any required degree of sharpness according to the density of the metal it is intended to work on.

What we claim as our improvement and as not before known, as we use the same, and for which we seek Letters Patent, is-

1. The inode of forming rotary Chaser Wheels and mounting them on adjustable carriages so as to fit them for cutting screws or screw bolts of any size with the same rake and pitch of thread and forming said wheels so that they may be ground and sharpened on the face so as to maintain a regular and equal cutting edge; as herein substantially described and set forth.

2. We further claim as new and not known before, as we use and form the same,

the formation of the rotary chaser wheel, irrespective of any mode of mounting the same for use, and we lastly claim the several modes of mounting and using said wheels in combination with other mechanical means and appliances, already well known as the same are herein substantially described and set forth.

In witness whereof we have hereunto set our hands this second day of January Vone thousand eight hundred and thirty eigh JAMES KEANE. [n 8.] Y THOMAS KEANE. [1.. 5.]

Witnesses: STEPHEN KANE, W. GERRELL. 

